1799 - First small pox vaccine administered
1846 - First public demonstration of anaesthesia in surgery
1861 - Louis Pasteur published his germ theory which proved that bacteria caused diseases
1895 - Discovery of x-rays
1923 - Heart valve surgery performed successfully for first time
1928 - Alexander Fleming discovers penicillin
1953 - Structure of DNA discovered
1952 - First organ transplant - a kidney - takes place
1954 - Clinical trials of birth control pill
1979 - MRI, or magnetic resonance imaging, scanned used to diagnose illness and injury.
1998 - The first adult live-donor liver transplant is carried out